#
# ChangeLog for /src/noit_check_resolver.h 
# 
# Generated by Trac 0.10.3
# 05/24/13 18:29:05
#


01/08/11 17:51:19 Theo Schlossnagle <jesus@omniti.com> [b553f9a4d73487ee85e5cfedf2cd67352b4d5e6b]
	* src/Makefile.in (modified)
	* src/java/com/omniti/jezebel/JezebelDispatch.java (modified)
	* src/java/com/omniti/jezebel/check/JDBC.java (modified)
	* src/java/com/omniti/jezebel/check/jmx.java (modified)
	* src/modules-lua/noit/module/haproxy.lua (modified)
	* src/modules-lua/noit/module/http.lua (modified)
	* src/modules-lua/noit/module/jezebel.lua (modified)
	* src/modules-lua/noit/module/memcached.lua (modified)
	* src/modules-lua/noit/module/munin.lua (modified)
	* src/modules-lua/noit/module/ntp.lua (modified)
	* src/modules-lua/noit/module/resmon.lua (modified)
	* src/modules-lua/noit/module/smtp.lua (modified)
	* src/modules-lua/noit/module/tcp.lua (modified)
	* src/modules-lua/noit/module/varnish.lua (modified)
	* src/modules/dns.c (modified)
	* src/modules/dns.xml (modified)
	* src/modules/lua.c (modified)
	* src/modules/ping_icmp.c (modified)
	* src/modules/snmp.c (modified)
	* src/modules/ssh2.c (modified)
	* src/noit_check.c (modified)
	* src/noit_check.h (modified)
	* src/noit_check_resolver.c (added)
	* src/noit_check_resolver.h (added)
	* src/noit_check_rest.c (modified)
	* src/noit_check_tools.c (modified)
	* src/noit_check_tools_shared.c (modified)
	* src/noit_conf_checks.c (modified)
	refs #340

	This is a rather major change.  Targets can now be hostnames in
	addition
	to IP addresses so long as //checks/@resolve_targets is not false.

	If a target is entered that does not look like an IP (inet_pton
	fails)
	then the check is marked as needing resolution NP_RESOLVE.

	A passive look-aside dns cache has been implemented in
	noit_check_resolver.c
	that is used to power the whole system and some reasonably simply
	console
	command have been provided:

	  show dns_cache [fqdn1 [fqdn2]]      -- shows the state
	  dns_cache <fqdn> [fqdn2 [fqdn3]]    -- submits for lookup
	  no dns_cache <fqdn> [fqdn2 [fqdn3]] -- purges from cache

	The big change is that modules that relied on check->target to be an
	IP
	address are going to explode when names are provided.  Instead,
	modules
	should now use target for the provided target (possibly a FQDN) and
	use
	target_ip (check->target_ip or check.target_ip) for a resolved IP
	address
	and also check for the case of empty string: (check->target_ip[0] ==
	'\0')
	for the case that resolution has failed.  In lua, the target_ip will
	be
	presented as nil in the case of failed name resolution.

	I believe I've updated all necessary components of the system for
	this to
	"just work" but people that have implemented their own check should
	update
	them before they elect to use non-IP addresses as targets.

	The dns subsystem supports both IPv4 and IPv6, but currently prefers
	IPv4
	addresses if any are present.